Electric heater



Oct. 11, 1938. R' 2,133,163

ELECTRIC HEATER Filed June 22, 1935 INVENTOR Patented Oct. 11, 1938UNITED STATES PATENT OFFICE 'IOlaims.

An object of this invention is to provide a heater of the characterdescribed having highly effective means to prevent short circuiting ofthe current carrying parts when the heater is applied, for example to amoistened wound strand.

A further object of this invention is to provide in a heater of thecharacter described insulating handles which serve as housings for theelectrical connections, and having highly improved means whereby thehandles may be permanently at- 5 tached to the casing so as to preventdisassembly of the parts or tampering of the electrical connections,thereby making the heater practical, foolproof and adapting it for longuse without requiring repair.

20 Another object of this invention is to provide a neat, compact andrugged heater of the character described which shall be relativelyinexpensive to manufacture, comprise few and simple parts, and whichshall yet be practical and 5 eflicient to a high degree.

Other objects of this invention will in part be obvious and in parthereinafter pointed out.

The invention accordingly consists in the features of construction,combinations of elements, 30 and arrangement of parts which will beexemplified in the construction hereinafter described, and of which thescope of application will be indicated in the following claims.

In the accompanying drawing, in which is shown one of the variouspossible illustrative embodiments of this invention,

Fig. 1 is a perspective view of the heater embodying the invention;

Fig. 2 is a cross-sectional view taken on line 40 2-2 Of Fig. 1;

Fig. 3 is a cross-sectional view taken on line 33 of Fig. 2;

Fig. 4 is a cross-sectional view taken on line 4-4 of Fig. 2;

45 Fig. 5 is a top plan view of the heater with one of the insulatinghandles removed;

Fig. 6 is a plan view of the inner side of the insulating handlehousing;

Fig. 7 is a longitudinal cross-sectional view 50 of one of the terminalswhich connects the leadin wire to the conductors; and

Fig. 8 is a cross-sectional view taken on line 8-8 of Fig. 4.

Referring now in detail to the drawing, the 55 heater In embodying theinvention comprises a pair of substantially similar symmetrical membersl i hinged together as hereinafter described. Each member ll comprises acasing I2 of curved cross section having an-outer curved wall l3, and aninner curved wall ll formed with longi- 5 tudinal flanges i 5 overturnedalong the longitudinal edges of said outer wall. Extending from saidinner curved wall it are end walls l6 having inwardly turned flanges l1folded over the end edges of the curved outer wall l3. Said 10 wall 13has an integral arm [9 formed with a pair of aligned, apertured ears 20at the side edges thereof. The arm l9 has a pair of spaced depressedportions 2| apertured, as at 22, for the purpose presently to appear.

The casing wall I3 is formed with an outwardly pressed or raised ridge24 having a portion 25 parallel to the inner end of arm i9, and portions26 parallel to one another and extending from said portion 25 toward theinner edge of said wall. The portion 28 of the wall l3 disposed betweenthe .ridge 24 and the inner edge of said wall is formed with a pair ofspacedopenings 29.

Disposed within the casing i2 is an electric heating element 30 ofsuitable construction comprising a high resistance wire wound on a heatresisting member and having a pair of lead-in wires 3| extending throughthe openings 29. Heat and electric insulating washers 32 received 30within the openings 29 are formed with central openings through whichthe lead-in wires pass.

Attached to the arm l9 is a handle 36 made of heat and electricinsulating material and comprising a housing portion 31 having a cover38 on the inner face thereof and interposed between said housing andarm. The cover 38 comprises a flat plate of substantially the same sizeas the arm l9 but having a flange 35 at the outer end 1 thereofextending at an angle thereto and over- 40 lying the outer edge lBa ofsaid arm. The plate or cover 38 contacts the depressed portions 22 ofthe arm l9 and has a plurality of small lugs or projectors 40 on theinner surface thereof to space said cover from said arm. The contactbetween the cover plate and the arm is thus only at the depressedportions 2! and at the points of contact between the lugs 40 and saidarm. The cover is provided with a pair of through openings 42registering with the openings in the depressed portions 22, which saidopenings receive rivets 43 embedded in the housing portion 31 of thehandle. Said housing portion is substantially fiat and is provided witha pair of longitudinal recesses or grooves 26. Said end 46 of saidhousing has an inclined surface 41 contacting said casing wall portion28 and a surface 48 adjacent surface 41, con-,

tacting the inner side of the ridge portion 25., It will be noted thatthe openings 29 in casing wall l3 are entirely covered by the ends 46 ofthe handle portions 31.'

The housing portion 31 extends beyond arm l9 and cover plate 38 toprovide a fingergrip portion 50 formed with a central relatively largehole 5|. The recesses or grooves 45 on the inner surface of said housingmember 31 are parallel to one another and disposed on opposite sides ofthe mid-section of said housing and extend somewhatbeyond the flange 39,as at 53, for

the purposehereinafter appearing.

Each of the grooves 45 comprises a relatively wide portion 56 at theouter end, a relatively narrow portion 51 at the inner end, and twospaced enlarged portions 58 interconnected by a relatively narrowportion 59. The lead-in wires 3| from the heating element pass into thegroove portions 51. The conductors'60 to the source of power pass intothe groove portions 56 through the ends 53 and are connected to thelead-in wires by terminal members 6|. The conductors 60 contact theouter surface of the flanges 39, said flanges preferably being rounded,as at 39a,

, to prevent cutting into the insulation of the conductor wires. Each ofsaid terminal members comprises a tube having a central thickenedportion 62 and thinner outer ends 63. The outer ends 63 may be flattenedor pressed together after the wires have been inserted into the terminalmember, for firmly clamping said wires thereto. The terminal members areplaced into the housing by inserting the thickened portions 62 thereofwithin the enlarged portions 58 of grooves 45, to prevent endwisemovement of said terminal members. e

The members II. are hinged together bymeans of a central bolt 65 passingthrough the apertures in the overlapping ears 20. A torsion spring 66 onsaid bolt has a portion 61 contacting one arm l9 and a portion .68contacting the other arm IQ for normally pressing the casing portionsl2. together. Upon pressing against the finger grip portions 50 thecasings may be separated for applying the heater to a strand of hairwound 'on a curler rod.

In giving permanent waves the wound strand of hair on the curler isusually treated with a softening or hair treating solution. The ridge 24extending around the front and sides of the inner end of the casingprevents any of the solution from entering the casing or coming incontact with the lead-in wires 3|. Short circuiting of the device isthus effectively prevented. The rivets 43 permanently attach the handlesto, the arms [9 with the covers 38 disposed between the housing 31 andsaid arms whereby. the handles cannot be disassembled without breakingthe same. Tampering with the electrical connections within .the handlesis thus effectively prevented.

It will thus be seen that there is provided a device in which theseveral objects of this invention are achieved, and which is welladapted to meet the conditions of practical use.

As various possible embodiments might be' made of the aboveiinvention,and as various changes might be made in the embodiment above set forth,it is to be understood that all matter herein set forth or shown in theaccompanying drawing is to be interpreted as illustrative and not in alimiting sense.

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. An electric hair waving heater comprising a pair of casings pivotedtogether, heating ele- .ments within said casings, insulating handlesatelements extending into said handles'through said ends.

2. In an electric hair waving heater, a hollow casing of curved crosssection having an arm extending therefrom, a cover overlying said arm,said cover having an angular flange at the outer end thereof overlyingthe outer edge of said arm, a substantially flat handle overlying saidcover, and means for attaching said arm to said cover and handle, saidhandle having recesses on the surface thereof adjacent said cover, aheat? ing element within said casing and lead-in wires from said wiresextending into said recess.

3. In an electric hair waving heater a casing having a heating eleme 17therein, a flat arm integrally formed with a d. extending from saidcasing, said arm having a plurality ofdepressed portions formed withapertures, a cover overlying said arm and having apertures registeringwith the first apertures and contacting said depressed portions, ahandlemember overlying said cover and contacting the same, rivetsextending through said registering apertures embedded within said handlemember for attaching the latter to said arm, said cover having a flangeat the outer end thereof overlying the outer end of said arm, said.handle member having a pair of grooves in the surface adjacent thecover, extending beyond the flange portion of the cover, lead-in wiresfrom the heating element extending into said grooves, conductor wiresextending integrally formed with and extending from said casing, saidarm having a plurality of depressed portions formed with openings, acover overlying said arm and having openings registeringwith the firstopenings and contacting said de-. pressed portions, and a handle memberoverlying said cover and contacting the same, rivets extending throughsaid registering openings embedded within said handle member forattaching the latter to said arm, said cover having a flange at theouter end thereof overlying the outer end of said arm, said handlemember having a pair of parallel grooves on the surface adjacent thecover, extending beyondthe flange a hair treating solution comprising apair of interpivoted casings. electric heating elements within saidcasings, a handle attached to each casing, said casings having outwardlypressed raised wall portions forming a ridge surrounding and adapted toreceive therein the inner ends of said handles, the lead-in wires fromthe heating elements extending into said handles, said ridge being soconstructed and arranged whereby to prevent said solution iron: inwires.

6. An electric hair waving heater adapted for use in connection with ahair treating liquid comprising a pair 01 casings having arms, means forpivotally interconnecting said arms, electric heating elements withinsaid casings, substantiallv flat insulating handles attached to saidarms, the inner ends or said handles contacting said casings, eachcasing being formed with a raised ridge having a portion parallel to thearm or said casing, and portions extending from the first portion towardsaid am, said ridge contacting said leadforming a depression forreceiving the inner end of the handle attached to said arm, the portionsof the casings contacted by the handles having apertures therein, thelead-in wires for said heating elements extending through said aperturesinto said-handles, whereby the said ridge serves to prevent the passageof said liquid from the outer surface of said casing to said lead-inwires.

7. A permanent wave heater adapted for use in connection with a hairtreating liquid, comprising a, pair of casings pivotally connected,heating electrical conductors leading from said heating elements andpassing through said handles, and

means whereby said electrical conductors are protected against contactwith said treatingliquid, said last named means comprising ridges on theouter surface or said casings surrounding the handle portions adjacentsaid casings.

(moms pm elements within said casings, electrically insulated handlescooperating with said casings,

